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26. Natural Theory / A. Speculations on Nature / 5. Infinite in Nature

1748	Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius]

26. Natural Theory / A. Speculations on Nature / 7. Later Matter Theories / c. Matter as extension

16684

Impenetrability only belongs to the essence of extension [Descartes]